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Re: Big Block Max RPM [Re: fast68plymouth] #2700616
09/24/19 09:14 PM
09/24/19 09:14 PM
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pittsburghracer Offline
"Little"John
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If you can get a car to 60 foot, the rest is all downhill. Start there, because the race does.


1970 Duster
Edelbrock headed 408
6.143@110.85 mph
9.73@135.05 mph shifting at 6700 RPM
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: Big Block Max RPM [Re: pittsburghracer] #2700624
09/24/19 09:43 PM
09/24/19 09:43 PM
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St. Paul , Mn.
tubtar Offline
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Originally Posted by pittsburghracer



If you can get a car to 60 foot, the rest is all downhill. Start there, because the race does.


Sort of what I was thinking.
That 60 is soft for the motor and gear , the e.t. and basically every other parameter that applies here.
Even foot braking , I'd expect a 1.4 ish number.

Re: Big Block Max RPM [Re: fast68plymouth] #2700660
09/25/19 04:46 AM
09/25/19 04:46 AM
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Chip Offline OP
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Lunati -Solid Roller part #53709 4800 - 8000 .738"/.738" 282/282 336/336 106/104 .022"/.024"

Tryin to make it to Mopar Madness at NED Saturday to put in sum more runs...

Re: Big Block Max RPM [Re: Chip] #2700677
09/25/19 06:56 AM
09/25/19 06:56 AM
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racerx Offline
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For a sort of comparison my e-body is 3350 race weight. 500",727,4.10,29.5 tire. My 60' usually anywhere around 1.29-1.30 with a best of 1.27 (which I think was a fluke) my mph is 139-140 with a best of 142. At 3150 race weight is this a glass/back half car?

Re: Big Block Max RPM [Re: racerx] #2700696
09/25/19 08:12 AM
09/25/19 08:12 AM
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On the bumper
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IF YOUR USING A 7,000 RPM CHIP....SOMETIMES THEY ARE NOT 100% ACCURATE. MAYBE YOUR 7000 CHIP IS 6700....TRY A 7200 CHIP , ETC


....BAD A$$ STREET CAR.....
Re: Big Block Max RPM [Re: n20mstr] #2700720
09/25/19 09:23 AM
09/25/19 09:23 AM
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Great Neck,LI,new york
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Long story short,,,,,,,,MSD says +/- 15% is ok.............not in my book!! I hope it's not the same when you program timing with their programmable products! runaway


HEMI-ITIS has no cure. My condition is fully BLOWN!!!

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Re: Big Block Max RPM [Re: Chip] #2700722
09/25/19 09:24 AM
09/25/19 09:24 AM
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Posts: 13,295
So. Burlington, Vt.
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fast68plymouth Offline
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Originally Posted by Chip
Lunati -Solid Roller part #53709 4800 - 8000 .738"/.738" 282/282 336/336 106/104 .022"/.024"

Tryin to make it to Mopar Madness at NED Saturday to put in sum more runs...


If you get a chance sometime, with the motor warmed up...... do a compression test on a couple cyls.
See what you get in 4 pumps, and then as many as it takes for the needle to stop climbing.

That cam has a lot of seat timing....... I’d be running 5500-6000 stall.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Big Block Max RPM [Re: fast68plymouth] #2700737
09/25/19 10:04 AM
09/25/19 10:04 AM
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MI, usa
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My car weighs 3350. Motor is 72 cubes bigger, -1 heads, 15-1. Similar intake cam timing (285/292-112). It has been quickest with a 6100 true flash, 4.30 10.5x31. Being your engine is smaller with similar intake timing and less compression I would bet it likes even more converter than mine. Best 60ft is 1.250 off the foot brake. I'd leave the 4.30 in it. Mine goes thru at 7300@150
Doug

Re: Big Block Max RPM [Re: racerx] #2700817
09/25/19 02:04 PM
09/25/19 02:04 PM
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Originally Posted by racerx
For a sort of comparison my e-body is 3350 race weight. 500",727,4.10,29.5 tire. My 60' usually anywhere around 1.29-1.30 with a best of 1.27 (which I think was a fluke) my mph is 139-140 with a best of 142. At 3150 race weight is this a glass/back half car?


3150lb with me in car and I weigh 210lb

Car is back-halfed ladder bar...glass fenders, hood and rear decklid...gutted with lexan

I will up the MSD 7AL-3 RPM Limit to an 8000 RPM module for this weekends tests...

Re: Big Block Max RPM [Re: n20mstr] #2700820
09/25/19 02:12 PM
09/25/19 02:12 PM
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Originally Posted by n20mstr
just an idea, is the trans full?? and what pan is on it?


you could also put some hyd fluid in it, but that's just a bandaid


2-inch deep pan

What does hyd fluid do?

Re: Big Block Max RPM [Re: fast68plymouth] #2700821
09/25/19 02:15 PM
09/25/19 02:15 PM
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Chip Offline OP
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Originally Posted by fast68plymouth
Originally Posted by Chip
Lunati -Solid Roller part #53709 4800 - 8000 .738"/.738" 282/282 336/336 106/104 .022"/.024"

Tryin to make it to Mopar Madness at NED Saturday to put in sum more runs...


If you get a chance sometime, with the motor warmed up...... do a compression test on a couple cyls.
See what you get in 4 pumps, and then as many as it takes for the needle to stop climbing.

That cam has a lot of seat timing....... I’d be running 5500-6000 stall.


I will test compression...

5500 stall converter from Pro-formance

Re: Big Block Max RPM [Re: n20mstr] #2700823
09/25/19 02:17 PM
09/25/19 02:17 PM
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Originally Posted by n20mstr

IF YOUR USING A 7,000 RPM CHIP....SOMETIMES THEY ARE NOT 100% ACCURATE. MAYBE YOUR 7000 CHIP IS 6700....TRY A 7200 CHIP , ETC


Going to an 8000 RPM Chip for testing...but I did order 7300-7500-7700-7900 chips and will work my way up.

Re: Big Block Max RPM [Re: Chip] #2700865
09/25/19 04:11 PM
09/25/19 04:11 PM
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Originally Posted by Chip
Originally Posted by n20mstr

IF YOUR USING A 7,000 RPM CHIP....SOMETIMES THEY ARE NOT 100% ACCURATE. MAYBE YOUR 7000 CHIP IS 6700....TRY A 7200 CHIP , ETC


Going to an 8000 RPM Chip for testing...but I did order 7300-7500-7700-7900 chips and will work my way up.


How high did you turn it on the dyno? If you have the dyno sheets then you should already have the answer to your question. If peak power was 6600 RPM then not much reason to turn more than that unless you're racing in a competitive class and you're trying to wring the last bit out of the run.

Re: Big Block Max RPM [Re: AndyF] #2700870
09/25/19 04:48 PM
09/25/19 04:48 PM
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Originally Posted by AndyF
Originally Posted by Chip
Originally Posted by n20mstr

IF YOUR USING A 7,000 RPM CHIP....SOMETIMES THEY ARE NOT 100% ACCURATE. MAYBE YOUR 7000 CHIP IS 6700....TRY A 7200 CHIP , ETC


Going to an 8000 RPM Chip for testing...but I did order 7300-7500-7700-7900 chips and will work my way up.


How high did you turn it on the dyno? If you have the dyno sheets then you should already have the answer to your question. If peak power was 6600 RPM then not much reason to turn more than that unless you're racing in a competitive class and you're trying to wring the last bit out of the run.


At 6800 RPM 585 torque and 757 HP

Re: Big Block Max RPM [Re: Chip] #2700882
09/25/19 04:59 PM
09/25/19 04:59 PM
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So. Burlington, Vt.
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As long as it has enough spring, with the cam you have......... I’m sure the motor would feel like it’s pulling fine to 7500 or so.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Big Block Max RPM [Re: fast68plymouth] #2700893
09/25/19 05:42 PM
09/25/19 05:42 PM
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pittsburghracer Offline
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It might be the dyno side coming out of most of you guys but this isn’t a top end issue. The thing is a turd in the first 60 foot to probably the 330 foot mark and until he addresses that with a better converter or chassis tuning will never run like it should. Get that sucker in the 1.35 area or hopefully better and his face will scream excitement.


1970 Duster
Edelbrock headed 408
6.143@110.85 mph
9.73@135.05 mph shifting at 6700 RPM
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: Big Block Max RPM [Re: fast68plymouth] #2700906
09/25/19 06:17 PM
09/25/19 06:17 PM
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Originally Posted by fast68plymouth
As long as it has enough spring, with the cam you have......... I’m sure the motor would feel like it’s pulling fine to 7500 or so.


That is true. It might not be making a lot of power but an engine like that will just sing for as long as you hold the pedal down. I've done that with a few engines where it just sings in the lights and I think I'm going fast but then when you look at the data you see that you aren't. Once the engine leans over there isn't much point in continuing to whip it even if it sounds good.

Re: Big Block Max RPM [Re: Chip] #2700923
09/25/19 07:28 PM
09/25/19 07:28 PM
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Bend,OR USA
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I tell all the new racers I help to move the shift lever when it quits pulling hard.
I've seen electric tach not read correctly and be off as much as 1000 RPM when ran with a good mechanical tach in the car shruggy work
Look at the time slip and write every change down so you can look at the results later away from the track to learn as much as you can from each run and day at the track up twocents
My current S/P car picked up 2.4 MPH in the 1/4 mile by raising the shift RPM from 7000 RPM to 7300 RPM at Woodburn in July. It had ran a 8.862 at 148. MPH on the second time trial run, I raised the shift RPM from 7000 RPM to 7300 RPM and the car ran 8.864 ET at 150. MPH on the next time trail run 1 hour later. work
I have a three step on the MSD 7AL2 box, the car also has a Biondo 400 box in it to run the throttle stop and shifter, I shift it off of RPM instead of time. It will play back the last run if I hit the line lock button just before I start the run. I've seen a 200 RPM difference on the shift playback from the RPM chips in the three step also work
IHTHs thumbs

Last edited by Cab_Burge; 09/25/19 07:38 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Big Block Max RPM [Re: Cab_Burge] #2703293
10/02/19 11:35 PM
10/02/19 11:35 PM
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Posts: 27,389
Balt. Md
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This is a slip from my 63 Sport Fury with my pump gas 493. Its a solid flat tappet cam of 264 & 270 @ .050 with .585 & .592 lift on a 110 LSA and has Indy EZ heads. I use a Luppo Dynamic 9.5 converter and I shift around 6200 when I actually do look at the tach and trap about 6400. Thats using 4.30's and Hoosier 30 x 9 radial slicks. The cars weighs right around 3700 without me. Never dyno'd but going by weight , et and mph it should be around 600 flywheel hp. You got a lot more in it and you need to find out where its lost. Good luck with it. Ron

[Linked Image]

Last edited by 383man; 10/02/19 11:37 PM.
Re: Big Block Max RPM [Re: 383man] #2703302
10/03/19 01:18 AM
10/03/19 01:18 AM
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aotearoa
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I have a 750 lift roller & -1 heads too but I have less cubes 455, but rev to 8k each gear. I'm 2450lbs & my junk runs 8.9s @153 mph with 4.88 rear gears & a 6200 stall converter.

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